1 ------------------------------------------------------------------------------
3 -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
5 -- S Y S T E M . O S _ P R I M I T I V E S --
9 -- Copyright (C) 1998-2005 Free Software Foundation, Inc. --
11 -- GNARL is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 2, or (at your option) any later ver- --
14 -- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNARL; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
20 -- Boston, MA 02110-1301, USA. --
22 -- As a special exception, if other files instantiate generics from this --
23 -- unit, or you link this unit with other files to produce an executable, --
24 -- this unit does not by itself cause the resulting executable to be --
25 -- covered by the GNU General Public License. This exception does not --
26 -- however invalidate any other reasons why the executable file might be --
27 -- covered by the GNU Public License. --
29 -- GNARL was developed by the GNARL team at Florida State University. --
30 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
32 ------------------------------------------------------------------------------
34 -- This is the OpenVMS/Alpha version of this file
38 package body System
.OS_Primitives
is
40 --------------------------------------
41 -- Local functions and declarations --
42 --------------------------------------
44 function Get_GMToff
return Integer;
45 pragma Import
(C
, Get_GMToff
, "get_gmtoff");
46 -- Get the offset from GMT for this timezone
48 function VMS_Epoch_Offset
return Long_Integer;
49 pragma Inline
(VMS_Epoch_Offset
);
50 -- The offset between the Unix Epoch and the VMS Epoch
52 subtype Cond_Value_Type
is System
.Aux_DEC
.Unsigned_Longword
;
53 -- Condition Value return type
55 ----------------------
56 -- VMS_Epoch_Offset --
57 ----------------------
59 function VMS_Epoch_Offset
return Long_Integer is
61 return 10_000_000
* (3_506_716_800
+ Long_Integer (Get_GMToff
));
70 -- status = returned status
71 -- pidadr = address of process id to be woken up
72 -- prcnam = name of process to be woken up
73 -- daytim = time to wake up
74 -- reptim = repitition interval of wakeup calls
79 Status
: out Cond_Value_Type
;
80 Pidadr
: in Address
:= Null_Address
;
81 Prcnam
: in String := String'Null_Parameter;
82 Daytim
: in Long_Integer;
83 Reptim
: in Long_Integer := Long_Integer'Null_Parameter
86 pragma Interface
(External
, Sys_Schdwk
);
87 -- VMS system call to schedule a wakeup event
88 pragma Import_Valued_Procedure
89 (Sys_Schdwk
, "SYS$SCHDWK",
90 (Cond_Value_Type
, Address
, String, Long_Integer, Long_Integer),
91 (Value
, Value
, Descriptor
(S
), Reference
, Reference
)
100 -- status = returned status
101 -- tim = current system time
106 Status
: out Cond_Value_Type
;
109 -- VMS system call to get the current system time
110 pragma Interface
(External
, Sys_Gettim
);
111 pragma Import_Valued_Procedure
112 (Sys_Gettim
, "SYS$GETTIM",
113 (Cond_Value_Type
, OS_Time
),
121 -- Hibernate (until woken up)
123 -- status = returned status
125 procedure Sys_Hiber
(Status
: out Cond_Value_Type
);
126 -- VMS system call to hibernate the current process
127 pragma Interface
(External
, Sys_Hiber
);
128 pragma Import_Valued_Procedure
129 (Sys_Hiber
, "SYS$HIBER",
138 function OS_Clock
return OS_Time
is
139 Status
: Cond_Value_Type
;
142 Sys_Gettim
(Status
, T
);
150 function Clock
return Duration is
152 return To_Duration
(OS_Clock
, Absolute_Calendar
);
155 ---------------------
156 -- Monotonic_Clock --
157 ---------------------
159 function Monotonic_Clock
return Duration renames Clock
;
165 procedure Timed_Delay
169 Sleep_Time
: OS_Time
;
170 Status
: Cond_Value_Type
;
173 Sleep_Time
:= To_OS_Time
(Time
, Mode
);
174 Sys_Schdwk
(Status
=> Status
, Daytim
=> Sleep_Time
);
182 function To_Duration
(T
: OS_Time
; Mode
: Integer) return Duration is
183 pragma Warnings
(Off
, Mode
);
185 return Duration'Fixed_Value (T
- VMS_Epoch_Offset
) * 100;
192 function To_OS_Time
(D
: Duration; Mode
: Integer) return OS_Time
is
194 if Mode
= Relative
then
195 return -(Long_Integer'Integer_Value (D
) / 100);
197 return Long_Integer'Integer_Value (D
) / 100 + VMS_Epoch_Offset
;
201 end System
.OS_Primitives
;